Update 0.8.0 docs for cumulative/continued RDSRs

[Ed McDonagh]

Troubleshooting doc refers to time rather than instances. Q-R logic ignores duplicates

[Ed McDonagh]

First draft of docs for ref #634. [skip ci], docs only

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[Ed McDonagh]

Restructured and reworded for ref #634. [skip ci], docs only

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[Ed McDonagh]

Added a couple of commas and the word OpenREM for ref #634. [skip ci], docs only

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[Ed McDonagh]

Added duplicates processing to QR logic docs. Refs #634. [skip ci], docs only

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[Ed McDonagh]

I'm happy with the changes, so I'm going to merge them in. Any comments gratefully received.

[Ed McDonagh]

Updating changes. Fixes #634

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